. >> stanley jacob son was last seen in february with this woman, regina butler. they found him at these apartments. why did it take so long? >> reporter: we have learned that police say the woman arrested in this case has confessed to the killing and that she will be charged with murder. they say the victim was stabbed multiple scenes and the crime scene was bad. >> reporter: she's been looking for her grandfather, and it turns out he was right under everybody's noses the whole time. you didn't smell anything? >> yes. it smelled like garbage. today you really smelled the dekay. >> reporter: he had been stabbed and his body stuffed under his mattress. she reported her grandfather missing, and nobody noticed the decomposing body in his apartment until the smell got really bad. >> at first it was a relief knowing he was there, and then i felt that i have been in here three times and didn't see him and that almost made me pass out. >> reporter: they says police have arrested this woman, 47-year-old butler. the granddaughter says she's a homeless alcoholic drug addict